Part I Signal Relay
Specialized Knowledge I Overview of Signal Relay
Exercise I
Specialized Knowledge II Vital Relay
Exercise Ⅱ
Specialized Knowledge III Timing Relay
Exercise III
Specialized Knowledge IV AC Two-element Relay
Exercise IV
Part II Signal
Specialized Knowledge I Overview of Signals
Exercise I
Specialized knowledge II Color-light Signals
Exercise II
Specialized Knowledge III Setting Principles and Structure of HSR Signals
Exercise III
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